Mold for thermite welding and the like



Patented Nov. 10, 1925.

UNITED STATESQPATENT oFFlci-z.

EDWARD FBANDSEN BEGTRUP. 0F JERSEY. CITY, NEW JERSEY, ASSIGNOVR TO' METAL & THERMIT COBYPQRA'TION'. 0Fv CHROME. NEW .TER-BEY, A CORP()RA'JEIOII"QI?` NEW JERSEY.

i MOLD ron 'rnmmrrn WELDING AND 'run Lum Application filed November 2, 192.3. Serial No. 612,316.

vTo all whom 'if 'may concern.'

Be it known that I, Enwann 11. Bm'rnirr, a citizen of the United States. and a resident of Jersey (lit-y, in the county of Hudson and Stute of New Jersey, have invented certain new and v useful Improvements in Molds for Therlnite 'elding and the like; and I dov'herehy declare the following to he a full, clear, and exact. description of the invention, such as will enable others skilled in the art to which it appertains t'o make and use the same.

'lhe inventionrelates to au i'un'n'ovenient in molds' for welding'thc ends of railway rails' and similar irregular sections h v the application of snpcrheated lnetah such as would be. produced by the thcrnlite method, in which the sections to lie 'welded and the interior of the in old are preheated .lrvunenns of an oil or gas llame, directed into the mold through a heating gate. usuallyY located near the bottoni of the' niold. The. object; of the V invention is toprovide nicaus for ventingr the products of combustion from the portions of the lnold in which saidvl'n'oducts would be cntrapped and result in an uneven heating,r of parts of Hte-sections and the mold and the consequent iinpilirnnent ol the welded joint.

'lhe invention is illustrated in the acronipanying: drawing'. in whiclr f 'lhe ligure is a .sectional elevation through a typical thermite mold for welding the adjacent ends ol two railway rails.

Refi-reinet to the drawing. lll 'indicates` the mold proper which is adapted to he clamped about the ends ofthe 'rail Sections in well `known manner to provide a. cavity ll snrro||n din,eIr the rail ends and intowhich the .supcrhcated molten lnelal is charged to fuse with and weld the adjacent rail sections 4to j fether in a substantial I-ion'iogeneons joint. tl is customary to prov-ide molds of this character with a heatinggate, such as 1. preferably located near the bottoni .of .the

mold and connnnnioating with the lowerA section of the mold cavity. through which gate a preheating 'lnediunn such as a gas or oil flame, is directedvfor the purpose of preheating the ends of the. `ails or other seetions to be welded and 'the adjacent; interior walls o'f the mold cavity. The egress of spent gases or products of combustion from A paired.

the interior of the nold during the preheating operation has heretofore been taken care of hy the. usual riser opening 2, pourin,f r grate opening 3. and vent opening 4, at the top of the mold. It has -been found, however. that these openings are insuicientto provide a proper and complete evacuation of the products of combnstion'from those portionsl of the mold cavity which constitute lateral pockets or recesses, which occur at the hase of the rail Sections-0r adjacent to projet-tions of other irregular Sections. and` when the spent gases are noteompletely evacuated from the mold cavity.

a'uniform aud ellicient prehcating canniot he ell'ccted because ot' the entrupped -spcnt gases. which act as an insulating medium and prevent-Hw hot active gases reaehilu.r the surface ol' the sections to bc-wcldcd and the surroundinpr walls ot' the mold cavity. which are enveloped or .screened by` the dead gases. he uniformly -ell'ected and Ath'e vresultant welded joint will ho -orrcspoiulingly inilt has` lrcen discovered, llu'-vevcr. that if the pockets or recesses, constitutin; r portions of the mold cavity, he provided 'with separate vents, a complete evacuation v of the productsl of combustion or spent gases may he readilyV cllected and uniform heating of the sections to lie welded and the iuteror of the -moldcavit v can lie hrought ahout without delay. y

I ln the particular cxemplilication of the invention illustrated in the drawing, a vent opening 5 extendinL;l laterally `vfrom the reentraut cavit t3 int`o which the base 7 of the rail projects. providesl a discharge for the spent gases which would otherwise tend to accumulate in the cavity t. lreferahly -the vent opening 5 vis located opposite thel heating ,frate l, so that the spent gases will he. swept. out of the lower port-ion of the mold cavity and the hottestportions of the heating gases will he. permitted to ilnpinge directly upon the rail ends and the walls of the moldcavity.

'hile the invention has been illustrated as'applid to a mold for welding' the ends Y o f railway rails, it will be understood that it will be equally applicable to all molds of this 'general type. which include a heating;r gate and which involve pockets or recesses As n result, the preheating cannot 7 illl \'vith'in'tl1e"1nol d cavity which would tend to trap and retain the products of combus- '1. A mold forwelding railwny rails andthe alike, having. n heatinggate -atfthevbottom 'theljeo and. n `vent opening slibstantiallyf opposite saidgate. n

2. ,A mold for welding irregular sections, involving a pocketfon. recess fin 'the'mold cnvity, said mold having nr' healing gatev wnneoting wiflitlieinteiioi' *at tlielipttoiii thereof, and a. vent opening connectin the pocket: orfreogSSg-witlig'tl kiki-i613 o the mold'.

f 3; A mold for welding railway -iails and the like, having lalienatingA gate'fat -the' Bot- ,.tomqthreof, and u,l vent opening idj'ucent the base of the mold cavity.

In testiinonyrvvlereof I nix my'signa- 2 EDWARD FRA'NDSEN BEGTRUP. 

